C# Program to Illustrate Lower Triangular Matrix

For the lower triangular matrix, set all the elements above the main diagonal to zero.

Set the following condition −

if (i >= j)
   Console.Write(A[i, j] + "\t");
else
   Console.Write("0\t");

Example

You can try to run the following code to display a lower triangular matrix.

Live Demo

using System;
using System.Linq;
class Demo {
   static void Main() {
      int m, n, i, j;
      Console.Write("Enter number of rows and columns of the matrix ");
      m = Convert.ToInt16(Console.ReadLine());
      n = Convert.ToInt16(Console.ReadLine());
      int[,] A = new int[10, 10];
      Console.Write("\nEnter matrix elements: ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            A[i, j] = Convert.ToInt16(Console.ReadLine());
         }
      }
      Console.Clear();
      Console.WriteLine("\nLower Triangular Matrix ");
      for (i = 0; i < m; i++) {
         for (j = 0; j < n; j++) {
            Console.Write(A[i, j] + "\t");
         }
         Console.WriteLine();
      }
      for (i = 0; i < m; i++) {
         Console.Write("
");
         for (j = 0; j < 3; j++) {
            if (i >= j)
               Console.Write(A[i, j] + "\t");
            else
               Console.Write("0\t");
         }
      }
      Console.ReadLine();
   }
}

Output

Enter number of rows and columns of the matrix  
Enter matrix elements:  
Lower Triangular Matrix